The **SDH3812-2R2-R** is a high-performance, surface-mount (SMD) power inductor. It is part of the SDH series, typically manufactured by companies like **Eaton (formerly Bussmann/Coiltronics)**. These components are designed for applications requiring high power density and a low profile. --- ### ## Technical Specifications Below are the primary electrical and physical characteristics of the SDH3812-2R2-R: | Parameter | Value | | :--- | :--- | | **Inductance** | 2.2 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~0.052 Ω (Typical) | | **Saturation Current ($I_{sat}$)** | ~1.65 A | | **RMS Current ($I_{rms}$)** | ~1.60 A | | **Operating Temperature** | -40°C to +125°C | | **Dimensions (L x W x H)** | 3.8 x 3.8 x 1.2 mm | | **Shielding** | Magnetically Shielded | --- ### ### Key Features 1. **Low Profile:** The "12" in the part number signifies a maximum height of approximately 1.2 mm, making it ideal for thin electronic devices like smartphones, tablets, and wearable tech. 2. **Magnetic Shielding:** The inductor is shielded to minimize Electromagnetic Interference (EMI), which is critical in densely packed circuit boards to prevent noise from affecting nearby components. 3. **Ferrite Core:** Utilizes a ferrite core material that provides high efficiency and low core losses at high switching frequencies. 4. **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and meets RoHS environmental standards. --- ### ### Typical Applications The SDH3812-2R2-R is commonly used in power management circuits, specifically: * **DC-DC Converters:** Buck, Boost, and SEPIC topologies. * **Battery Powered Devices:** Due to its small footprint and efficiency. * **LED Drivers:** Providing stable current for backlight or illumination LEDs. * **Portable Computing:** Used in power rails for CPUs and peripheral interfaces. --- ### ### Internal Structure (Conceptual) ```yaml Component: Power Inductor Structure: - Core: Ferrite drum core - Winding: Copper wire (Enameled) - Shielding: Ferrite ring/epoxy mix - Termination: Solder-plated copper pads ```